Air heater



FIG. 1 is a front elevation view of an air heater showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is an A—A cross section view of FIG. 6;

FIG. 8 is a perspective view thereof;

FIG. 9 is an enlarged view of FIG. 5;

FIG. 10 is a rear elevation view showing an another embodiment of my new design;

FIG. 11 is a left side elevation view thereof;

FIG. 12 is a right side elevation view thereof;

FIG. 13 is a top plan view thereof;

FIG. 14 is a bottom plan view thereof;

FIG. 15 is an A—A cross section view of FIG. 14;

FIG. 16 is an perspective view thereof; and,

FIG. 17 is an enlarged view of FIG. 13. 

The ornamental design of an air heater, as shown and described. 